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Research & References

The Sources Behind Our Tree Care Facts

Every figure in the “facts” sections across our website comes from APPEX’s own service standards or from one of the 15 references below, most of them published by the International Society of Arboriculture (ISA). Each entry lists the pages where we cite it.

  • 15 references
  • 8 publishers
  • 11 pages that cite them

International Society of Arboriculture (ISA)

8 references

ISA

1 reference

TexasOakWilt.org

1 reference

Texas Invasive Species Institute (TexasInvasives.org)

1 reference

Texas Parks and Wildlife Department

1 reference

U.S. Department of Agriculture

1 reference

National Weather Service

1 reference

NOAA

1 reference

APPEX arborists clearing branches beside a wood chipper on a residential street

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